IBPSA1991

The technique of field modelling is applied to predict the indoor air movement and convective heat transfer induced by thermal sources in big enclosures. This is achieved by solving a system of partial differential equations describing the conservation of momentum, enthaply and mass. The k-e model is used to describe the turbulent effect. The equations are discretized using finite difference method and solved by the Semi-Implict-Method-for Pressure-Linked-Equations-Revised (SIMPLER) scheme.

The need for increasingly sharp modelling of building energy behaviour allowing comfort to be evaluated within a heated, ventilated dwelling room leads Electricite De France ADE Department to develop an air interior movement simulation model. This is a simplified modelling which it could be possible to integrate into a global building science-of-heat software programme (CLIM2000). The design principle is the division of the air volume of the room into areas for wich mass and energy balances are computed.

The "object oriented programming" and model reduction tniques give some new possibilities to develop computer tools. It is now possible to design a building on the computer, using computer objects corresponding to architectural concepts (materials, walls, windows .... ). Representing the building as a structure of objects is an approach which is particularly adapted to a thermal analysis and a comparison of designs, possibly with the help of an expert interface.

This paper describes two simulation software packages which permit building designers to understand how buildings will perform: the ESP building energy simulation system and the ARIA Computational Fluid Dynamics (CFD) air distribution simulation system. One of the major problems with CFD code is the specification of boundary conditions for the problem. ESP can provide the boundary conditions information for the CFD airflow, simulation. Two brief case studies are presented which illustrate the ability to provide the boundary conditions for the CFD problem from ESP.

The Energy Kernel System (EKS) project has reached the final year of its three year duration. The modus operandi has been designed, a class taxonomy devised and the software implementation process commenced. This paper describes the elements of the EKS as it is now envisaged and elaborates on the object oriented programming (OOP) approach being employed in its construction. In particular, the form and content of the EKS classes, the role of inheritance and the scope of the in?built domain theories are elaborated.

Hot-2000 is a computer model which assists builders, engineers, and architects in the design and simulation of residential buildings for thermal effectiveness, passive solar heating, and the operation and performance of heating and cooling systems. Many of the basic heat loss algorithms were derived or adapted from the National Research Council of Canada's HOTCAN 3.0 program. Major additions and modifications have been made, mainly in the simulation of heating, ventilation and cooling systems. Weather data libraries are available for 76 Canadian locations and for 194 U.S. locations.

This paper describes a computer simulation program being developed at the Hong Kong Polytechnic for dynamic modelling of heat and moisture transport in buildings. At present, the program can simulate simultaneous heat and moisture transfer in the walls and slabs of a room and its effect on the room temperature and humidity. Effects of outdoor weather and air?conditioning are simultaneously simulated.

A new bioclimatic building concept based on solardriven ventilation is analysed through the use of physical and numerical modelling. Measurements are conducted for a 1/12th laboratory scale model designed to replicate the full-scale prototype and its microclimate. Predictions are obtained by employing advanced Computational Fluid Dynamics (CFD) techniques, and the experimental results provide the benchmarking required in the development of the numerical model, which may offer a viable alternative to expensive and hard to set full-scale tests.

Me Energy Kernel System (EKS) is an energy simulation environment that facilitates the creation, validation and maintenance of simulation programs using the object-oriented programming (OOP) paradigm. Ibis paper introduces the particular aspect of the EKS development concerning the fundamental issues of system representation; that is, the theory encapsulation and system solution which constitute the implementation of the generalised solver classes in the object-oriented environment.

The transient simulation program TRNSYS was originally developed to aid in the study of solar energy systems. It was first made public in 1975 when Version 6.0 wag released. Since then it has undergone continual development, and a series of versions have been documented, released, and supported. The current version, 13.1, was released in October, 1990, and is available in mainframe, IBM PC and Macintosh formats.